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AME 31:163-174 (2003)
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Abstract
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Seasonal changes in the taxonomic composition of bacterioplankton in a coastal oligotrophic system
Michael Schauer1,2, Vanessa Balagué1, Carlos Pedrós-Alió1, Ramon Massana1,*
1Institut de Ciències del Mar, CMIMA, CSIC, Passeig Marítim de la Barceloneta 37-49, 08003 Barcelona, Catalonia, Spain
2Present address: Institute for Limnology Mondsee, Austrian Academy of Sciences, Mondseestrasse 9, 5310 Mondsee, Austria
*Corresponding author. Email: ramonm@icm.csic.es
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ABSTRACT: The succession of taxa within the bacterioplankton assemblage was followed over a whole seasonal cycle in Blanes Bay, an oligotrophic coastal system (average chl a: 0.5 µg l-1) in the NW Mediterranean Sea. Phylogenetic
composition of the bacterioplankton was studied by means of DGGE (denaturing gradient gel electrophoresis) and sequencing of predominant bands. Analysis of DGGE fingerprints showed gradual changes in the dominant bacterial members over the sampling
period. The time scale during which a single population appeared in significant amounts in the system ranged between weeks and months. Most of the DGGE bands sequenced showed high similarities to sequences of uncultured marine bacteria. The bacterial
assemblage appeared to be dominated by members of a-Proteobacteria (mostly from the Roseobacter clade), Cytophaga-Flavobacteria-Bacteroides (CFB) and cyanobacteria throughout the year. Two bands related to
prasinophyte chloroplasts were detected, whereas no bands related to SAR11 (a-Proteobacteria) or SAR86 (g-Proteobacteria) clusters were found. Contrasting with the relative stability of
broad phylogenetic groups, examination of bands belonging to a-Proteobacteria, CFB and cyanobacteria revealed a substitution of closely related phylotypes during the seasonal cycle within each one of these 3 groups.
Overall, the taxonomic composition of the bacterioplankton in this coastal marine system appeared to be rather stable in time, showing gradual changes throughout the year.
KEY WORDS: Marine bacteria · DGGE · Fingerprinting · 16S rDNA · Seasonal succession
Full text in pdf format
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Published in AME Vol.
31, No. 2
(2003) on March 13
Print ISSN: 0948-3055; Online ISSN: 1616-1564.
Copyright © Inter-Research, Oldendorf/Luhe, 2003
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